$FD02/64770: Check For 8-ROM
Jump from $FCE7, $FE56:
FD02: A2 05 LDX #$05
Jump from $FD0D:
FD04: BD 0F FD LDA $FD0F,X
FD07: DD 03 80 CMP $8003,X
FD0A: D0 03 BNE $FD0F
FD0C: CA DEX
FD0D: D0 F5 BNE $FD04
Jump from $FD0A:
FD0F: 60 RTS
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Kernal-Reference:
LDA $FD0F,X : $FD04